Is the purity of advanced ceramic materials the better?

Commonly used alumina ceramics, zirconia ceramics, silicon nitride ceramics, alumina ceramics are the most widely used. Alumina ceramics, in the same process molding, high purity. Of course, the higher the purity, the higher the price. At present, the purity of precision alumina ceramic mechanical structure parts in the domestic market is generally 99%.95% of the ceramic structural parts are generally made of electrical ceramic insulation parts with low requirements. The content of alumina ceramic substrate used in electronics is 96%.
In addition to the purity of alumina ceramic products, the higher the better, at present, zirconia ceramics and silicon nitride ceramics in the production of powder before, are to add trace elements, in order to make the product sintering, better performance. These trace elements, not the impurities of the material, is the material formula developed successfully for countless times. Before adding trace elements, the purity of the main powder is very high, reaching more than 99%. Therefore, the market can not do more than 99% purity of silicon nitride ceramics and zirconia ceramic products.
Our performance requirements for a product are not single, generally require to meet several performance. Such as electronic ceramic substrate, mainly insulation on the line, but we also hope that it has better heat dissipation performance, low density, thin and light, high strength. When we have many requirements on the comprehensive performance of ceramics, we can start with the method of adjusting the formula, add other ingredients, manufacture composite ceramics, to meet the requirements of the use of products. Composite ceramics added to other formulations, there isno higher purity, the better the problem.